Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4261c1e008756d…

MALICIOUS

PDF

82.0 KB Created: 2021-07-14 03:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7a9021883ec2b0321b020b9f170c1f86 SHA-1: c3af1bc05e12944cd384ed92aa09a4bb69a5b1a1 SHA-256: 7f4261c1e008756d7ecf23a6b9a5c81272c9e6ba1f1d485627b98199a6203923
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous embedded URLs that point to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to external resources, likely to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/14592830665.pdf In PDF document text
    • http://goldnumber.info/userfiles/file/dimowowog.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/dasoludukobaselofif.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/84539494088.pdfIn PDF document text
    • http://khochailo.com/upload/ck/files/nafefikus.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbb10059c---88166307476.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/43772016699.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/g2c179e15i7j6gllt62bnj2iop/55181793723.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160957ac2e346f---kafosazigujemejonasibeb.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/33992477385.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/xodenosizixawip.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/56424129801.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/19845729995.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/0kqvi50ar399270npok3bjti8t/88621459550.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/nuvunevutujamebezitogo.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8be88a45d---21158381930.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/zanesepemevuwapepugute.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/83009538296.pdfIn PDF document text
    • https://stopserv.ru/files/file/likabuluponobinuwif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=homescapes+hacks+that+actually+workPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 10828 bytes
SHA-256: df9364368ed9f0355bd90a25e3c8d7e41e26dadc56a5370be2e6f43e31af26da
font_01_sfnt_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 16436 bytes
SHA-256: 38b87f6c187f4ea0363925d5b282f3d1bb617ca5335a0db3ea91f9e33a93c7bc